johnnypyro Posted November 27 Posted November 27 I have tried optical yellows using the Buell red-green system but found that the Strontium always seems to add a red tinge. I don't have Shellac, Cryolite, or AP so there are not many alternatives for a non-hygroscopic yellow, but found this composition and thought I'd give it a try. https://pyrodata.com/chemicals/Sodium-oxalate?page=1
cmjlab Posted November 27 Posted November 27 I think the Spanish yellow says you can also use Sodium Oxalate (though I've only trued with cryolite, so I have no idea what it would look like). All the other Spanish colors are pretty good to my eye though, so I'd bet it's worth trying.
Arthur Posted November 27 Posted November 27 sodium makes yellows BUT most sodium salts are soluble and hygroscopic, CRYOLITE being a solid rock is a solid colour donor, sodium oxalate is probably the only economic insoluble non hygroscopic sodium salt. There's no point in expensive compounds that make a batch of stars cost a small space shot budget.
Mumbles Posted November 27 Posted November 27 Are you testing the stars up close or up in the air? I've never personally noticed much of a tinge when up in the air. If you want to hedge your bets, you could mix in some sodium bicarbonate (baking soda) or sodium oxalate to a buell-type system. It works to make a bright sodium yellow at 100% substitution, I just don't prefer sodium yellows.
johnnypyro Posted November 27 Author Posted November 27 @Mumbles In short, both. I view the stars deployed from small bombettes viewed at less than 10m. I accept it might just be bias after viewing lots of different ratios of red and green (I should say that Buell red and green are really great compositions). The oxalate yellow didn't have the orange that you get from NaNO3, but it is a bit dim and can't compete with combinations of any other bright colours or titanium streamers. It's definitely not the canary yellow that you see in commercial fireworks.
Carbon796 Posted November 27 Posted November 27 (edited) I never came up with a optical red/grn yellow, that I ever cared for. ( even following other's known formulas/ratios. ) Not that I spent a whole lot of time pursuing it. Sodium based yellows have always looked better to me. ( both color hue and color saturation ) But, it seems like everyone forgets that you can optically tune sodium yellows. ( It's funny how addiment some people are against them. But never put any effort in to tuning them. - Not referring to Mumbles. - They also make excellent optically tuned oranges. ) Just straight sodium based yellows are often too amber colored. Fyi, even though you don't have cryolite. I always thought it was the better looking non tuned sodium colorant. That will probably look great with a non metal blue or low metal purple. Or sub a little of the RG for Mg/Al to brighten it up some. I used to shoot Bleser's new blue with a Mike S resin yellow shell quite often. Just because everyone in the club pretty much always loved/complimented me on it. Edited November 28 by Carbon796
Carbon796 Posted November 27 Posted November 27 3 hours ago, Arthur said: sodium makes yellows BUT most sodium salts are soluble and hygroscopic, CRYOLITE being a solid rock is a solid colour donor, sodium oxalate is probably the only economic insoluble non hygroscopic sodium salt. There's no point in expensive compounds that make a batch of stars cost a small space shot budget. I put up a 3brk 8" once. It had nearly $100 in just the antimony in it 🤩. Some times, you just have to build, what you want to build.
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